+ for (pos->mmap_offset = 0; pos->mmap_offset < filestats.st_size; ) {
+ uint64_t stream_id = 0;
+
+ if (pos->base) {
+ /* unmap old base */
+ ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
+ if (ret) {
+ fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
+ strerror(errno));
+ return ret;
+ }
+ pos->base = NULL;
+ }
+ /* map new base. Need mapping length from header. */
+ pos->base = mmap(NULL, MAX_PACKET_HEADER_LEN / CHAR_BIT, PROT_READ,
+ MAP_PRIVATE, pos->fd, pos->mmap_offset);
+ pos->content_size = MAX_PACKET_HEADER_LEN; /* Unknown at this point */
+ pos->packet_size = MAX_PACKET_HEADER_LEN; /* Unknown at this point */
+ pos->offset = 0; /* Position of the packet header */
+
+ packet_index.offset = pos->mmap_offset;
+ packet_index.content_size = 0;
+ packet_index.packet_size = 0;
+
+ /* read and check header, set stream id (and check) */
+ if (td->packet_header) {
+ /* Read packet header */
+ ret = generic_rw(&pos->parent, &td->packet_header->p);
+ if (ret)
+ return ret;
+ len_index = struct_declaration_lookup_field_index(td->packet_header->declaration, g_quark_from_static_string("magic"));
+ if (len_index >= 0) {
+ struct definition_integer *defint;
+ struct definition *field;
+
+ field = struct_definition_get_field_from_index(td->packet_header, len_index);
+ assert(field->declaration->id == CTF_TYPE_INTEGER);
+ defint = container_of(field, struct definition_integer, p);
+ assert(defint->declaration->signedness == FALSE);
+ if (defint->value._unsigned != CTF_MAGIC) {
+ fprintf(stdout, "[error] Invalid magic number 0x%" PRIX64 " at packet %u (file offset %zd).\n",
+ defint->value._unsigned,
+ file_stream->pos.packet_index->len,
+ (ssize_t) pos->mmap_offset);
+ return -EINVAL;
+ }
+ }
+
+ /* check uuid */
+ len_index = struct_declaration_lookup_field_index(td->packet_header->declaration, g_quark_from_static_string("uuid"));
+ if (len_index >= 0) {
+ struct definition_array *defarray;
+ struct definition *field;
+ uint64_t i;
+ uint8_t uuidval[UUID_LEN];
+
+ field = struct_definition_get_field_from_index(td->packet_header, len_index);
+ assert(field->declaration->id == CTF_TYPE_ARRAY);
+ defarray = container_of(field, struct definition_array, p);
+ assert(array_len(defarray) == UUID_LEN);
+ assert(defarray->declaration->elem->id == CTF_TYPE_INTEGER);
+
+ for (i = 0; i < UUID_LEN; i++) {
+ struct definition *elem;
+ struct definition_integer *defint;
+
+ elem = array_index(defarray, i);
+ assert(elem);
+ defint = container_of(elem, struct definition_integer, p);
+ uuidval[i] = defint->value._unsigned;
+ }
+ ret = uuid_compare(td->uuid, uuidval);
+ if (ret) {
+ fprintf(stdout, "[error] Unique Universal Identifiers do not match.\n");
+ return -EINVAL;
+ }
+ }
+
+
+ len_index = struct_declaration_lookup_field_index(td->packet_header->declaration, g_quark_from_static_string("stream_id"));
+ if (len_index >= 0) {
+ struct definition_integer *defint;
+ struct definition *field;
+
+ field = struct_definition_get_field_from_index(td->packet_header, len_index);
+ assert(field->declaration->id == CTF_TYPE_INTEGER);
+ defint = container_of(field, struct definition_integer, p);
+ assert(defint->declaration->signedness == FALSE);
+ stream_id = defint->value._unsigned;
+ }
+ }
+
+ if (!first_packet && file_stream->stream_id != stream_id) {
+ fprintf(stdout, "[error] Stream ID is changing within a stream.\n");
+ return -EINVAL;
+ }
+ if (first_packet) {
+ file_stream->stream_id = stream_id;
+ if (stream_id >= td->streams->len) {
+ fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
+ return -EINVAL;
+ }
+ stream = g_ptr_array_index(td->streams, stream_id);
+ if (!stream) {
+ fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
+ return -EINVAL;
+ }
+ file_stream->stream.stream_class = stream;
+ }
+ first_packet = 0;
+
+ if (stream->packet_context) {
+ /* Read packet context */
+ ret = generic_rw(&pos->parent, &stream->packet_context->p);
+ if (ret)
+ return ret;
+ /* read content size from header */
+ len_index = struct_declaration_lookup_field_index(stream->packet_context->declaration, g_quark_from_static_string("content_size"));
+ if (len_index >= 0) {
+ struct definition_integer *defint;
+ struct definition *field;
+
+ field = struct_definition_get_field_from_index(stream->packet_context, len_index);
+ assert(field->declaration->id == CTF_TYPE_INTEGER);
+ defint = container_of(field, struct definition_integer, p);
+ assert(defint->declaration->signedness == FALSE);
+ packet_index.content_size = defint->value._unsigned;
+ } else {
+ /* Use file size for packet size */
+ packet_index.content_size = filestats.st_size * CHAR_BIT;
+ }
+
+ /* read packet size from header */
+ len_index = struct_declaration_lookup_field_index(stream->packet_context->declaration, g_quark_from_static_string("packet_size"));
+ if (len_index >= 0) {
+ struct definition_integer *defint;
+ struct definition *field;
+
+ field = struct_definition_get_field_from_index(stream->packet_context, len_index);
+ assert(field->declaration->id == CTF_TYPE_INTEGER);
+ defint = container_of(field, struct definition_integer, p);
+ assert(defint->declaration->signedness == FALSE);
+ packet_index.packet_size = defint->value._unsigned;
+ } else {
+ /* Use content size if non-zero, else file size */
+ packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
+ }
+ } else {
+ /* Use file size for packet size */
+ packet_index.content_size = filestats.st_size * CHAR_BIT;
+ /* Use content size if non-zero, else file size */
+ packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
+ }
+
+ /* Validate content size and packet size values */
+ if (packet_index.content_size > packet_index.packet_size) {
+ fprintf(stdout, "[error] Content size (%zu bits) is larger than packet size (%zu bits).\n",
+ packet_index.content_size, packet_index.packet_size);
+ return -EINVAL;
+ }
+
+ if (packet_index.packet_size > (filestats.st_size - packet_index.offset) * CHAR_BIT) {
+ fprintf(stdout, "[error] Packet size (%zu bits) is larger than remaining file size (%zu bits).\n",
+ packet_index.content_size, (filestats.st_size - packet_index.offset) * CHAR_BIT);
+ return -EINVAL;
+ }
+
+ /* Save position after header and context */
+ packet_index.data_offset = pos->offset;
+
+ /* add index to packet array */
+ g_array_append_val(file_stream->pos.packet_index, packet_index);
+
+ pos->mmap_offset += packet_index.packet_size / CHAR_BIT;
+ }
+
+ /* Move pos back to beginning of file */
+ ctf_move_pos_slow(pos, 0, SEEK_SET); /* position for write */
+
+ return 0;
+}
+
+/*
+ * Note: many file streams can inherit from the same stream class
+ * description (metadata).
+ */
+static
+int ctf_open_file_stream_read(struct ctf_trace *td, const char *path, int flags)
+{
+ int ret;
+ struct ctf_file_stream *file_stream;
+
+ ret = openat(td->dirfd, path, flags);
+ if (ret < 0)
+ goto error;
+ file_stream = g_new0(struct ctf_file_stream, 1);
+ ctf_init_pos(&file_stream->pos, ret, flags);
+ ret = create_stream_packet_index(td, file_stream);
+ if (ret)
+ goto error_index;
+ /* Add stream file to stream class */
+ g_ptr_array_add(file_stream->stream.stream_class->files, file_stream);
+ return 0;
+
+error_index:
+ ctf_fini_pos(&file_stream->pos);
+ close(file_stream->pos.fd);
+ g_free(file_stream);
+error:
+ return ret;
+}
+
+static
+int ctf_open_trace_read(struct ctf_trace *td, const char *path, int flags)
+{
+ int ret;
+ struct dirent *dirent;
+ struct dirent *diriter;
+ size_t dirent_len;
+
+ td->flags = flags;
+
+ /* Open trace directory */
+ td->dir = opendir(path);
+ if (!td->dir) {
+ fprintf(stdout, "[error] Unable to open trace directory.\n");
+ ret = -ENOENT;
+ goto error;
+ }
+
+ td->dirfd = open(path, 0);
+ if (td->dirfd < 0) {
+ fprintf(stdout, "[error] Unable to open trace directory file descriptor.\n");
+ ret = -ENOENT;
+ goto error_dirfd;
+ }
+
+ /*
+ * Keep the metadata file separate.
+ */
+
+ ret = ctf_open_trace_metadata_read(td);
+ if (ret) {
+ goto error_metadata;
+ }
+
+ /*
+ * Open each stream: for each file, try to open, check magic
+ * number, and get the stream ID to add to the right location in
+ * the stream array.
+ */
+
+ dirent_len = offsetof(struct dirent, d_name) +
+ fpathconf(td->dirfd, _PC_NAME_MAX) + 1;
+
+ dirent = malloc(dirent_len);
+
+ for (;;) {
+ ret = readdir_r(td->dir, dirent, &diriter);
+ if (ret) {
+ fprintf(stdout, "[error] Readdir error.\n");
+ goto readdir_error;
+ }
+ if (!diriter)
+ break;
+ /* Ignore hidden files, ., .. and metadata. */
+ if (!strncmp(diriter->d_name, ".", 1)
+ || !strcmp(diriter->d_name, "..")
+ || !strcmp(diriter->d_name, "metadata"))
+ continue;
+ ret = ctf_open_file_stream_read(td, diriter->d_name, flags);
+ if (ret) {
+ fprintf(stdout, "[error] Open file stream error.\n");
+ goto readdir_error;
+ }
+ }
+
+ free(dirent);